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Former New York City Mayor Rudy Giuliani is headlining a new cable TV spot for GOP Congressional contender George Demos, claiming he'd be a “great congressman” and defending him against critics.

State Sen. Lee Zeldin gives his own local narrative in a 60-second radio ad just released.

Giuliani, in the 30-second spot appearing on Fox News and other channels, said, “Like me, my friend George Demos was a prosecutor, and he’s running to fix the mess in Washington.” He added, “George would never vote to raise taxes or support Obamacare.”

Demos began airing his fifth ad Thursday in his battle against Zeldin who both the Republican and Conservative leaders have designated as their candidate in a June 24 GOP primary for the right to face Rep. Tim Bishop (D-Southampton) in November.

In the ad, Giuliani also defended Demos, a former Security and Exchange Commission lawyer, saying: “Don’t believe attacks from his opponents, I know George Demos. He is a man of integrity and character.”

Zeldin backers have attacked Demos as a political opportunist trying to undercut the party’s chosen candidate by relying on millions of dollars from his father-in-law, a West Coast developer who in the past has supported former House Speaker Nancy Pelosi and Hillary Clinton. “This money is connected directly from the mother of Obamacare,” said Jesse Garcia, Brookhaven GOP chairman. He added Zeldin will oppose and repeal Obamacare when he gets to Congress.

However, Kevin Tschirhart, Demos’ campaign manager, said the “powerful ad again demonstrates that George Demos is the only candidate who can defeat liberal Democrat Tim Bishop.”

Announcer: Lee Zeldin is a local story we can all be proud of. Born and raised here, Lee and his wife, Diana, are now raising their twin daughters here.

Lee is a former Army paratrooper with the 82nd Airborne, and serves today as a major in the Army Reserves.

As a New York State senator, Lee Zeldin successfully led the fight to repeal the MTA Payroll Tax for 80 percent of employers .?.?. eliminated the saltwater fishing license fee .?.?. and secured funding for veterans with PTSD.

Lee Zeldin also led the fight against Obamacare in the State Senate.

Stopping Obamacare is a big reason Lee Zeldin is running for Congress. He’s never supported it -- and never will.